Finding the Fourth Proportional to 2,518.51, 3,475.39 and 1,399.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,518.51 : 3,475.39 = 1,399.38 : x
2. Step 2: Convert to fraction form
   2,518.51/3,475.39 = 1,399.38/x
3. Step 3: Cross multiply
   2,518.51x = 3,475.39 × 1,399.38
4. Step 4: Simplify right side
   2,518.51x = 4,863,391.26
5. Step 5: Solve for x
   x = 4,863,391.26/2,518.51
6. Step 6: Final answer
   x = 1,931.06